I. Introduction, 569. — II. Definition of the group, 570. — III. Demand conditions — the two-characteristics case, 573. — IV. The case of three characteristics, 576. — V. Four or more characteristics. 581. — VI. Cost conditions, 584. — VII. Entry and equilibrium, 586. — VIII. Further implications, 587. — IX. Conclusion, 589.
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Archibald et al. (1975) studied this question.